7：第四次作业问题22" />" /> A：Demand compensation from the hotel. B： Ask for an additional discount. C： Complain to the hotel manager. D： Find a cheaper room in another hotel. ...

1：第四次作业问题28" />" /> A：She was fond of living an isolated life. B： She was fascinated by American culture. C： She was very generous in offering help. D：She was highly devoted to her family. ...

3：第三次作业问题26" />" /> A：Monitor students’ sleep patterns. B：Help students concentrate in class. C：Record students’ weekly performance. D：Ask students to complete a sleep report. ...

5：第二次作业问题25" />" /> A：Changing her major. B：Spending less of her parents' money. C：Getting transferred to the English Department. D：Leaving the university. ...

11：第三次作业问题18" />" /> A：By heating dry ice. B：By turning ordinary ice into steam. C：By passing steam over dry ice. D：By mixing dry ice with ordinary ice. ...

1：第二次作业问题20" />" /> A：Practical work. B：Collective activities. C：Teacher's encouragement. D：Book knowledge. ...

9：第一次作业问题15" />" /> A：7 o’clock. B：8 o’clock. C：9 o’clock. D：10 o’clock. ...

3：第一次作业问题19" />" /> A：By raising cattle B：By working on farms C：By working in factories D：By raising sheep ...

7：第三次作业问题14" />" /> A：Children don't get enough education in safety. B：Children are keen on dangerous games. C：The playgrounds are in poor condition. D：The playgrounds are overcrowded. ...

3：第二次作业问题18" />" /> A：A rescuer on the Golden Gate Bridge. B：A professional diver. C：A telephone operator. D：A guard on the Golden Gate Bridge. ...